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Unconditional Accumulation of Nonclassicality in a Single‐Atom Mechanical Oscillator
Author(s) -
Podhora Lukáš,
Pham Tuan,
Lešundák Adam,
Obšil Petr,
Čížek Martin,
Číp Ondřej,
Marek Petr,
Slodička Lukáš,
Filip Radim
Publication year - 2020
Publication title -
advanced quantum technologies
Language(s) - English
Resource type - Journals
ISSN - 2511-9044
DOI - 10.1002/qute.202000012
Subject(s) - wigner distribution function , observable , phonon , physics , gaussian , nonlinear system , atom (system on chip) , fock space , quantum mechanics , coherent states , excitation , quantum harmonic oscillator , quantum , quantum entanglement , monotonic function , statistical physics , mathematics , computer science , embedded system , mathematical analysis
The robust experimental accumulation of nonclassicality of motion of a single trapped ion is reported. The nonclassicality stems from deterministic incoherent modulation of thermal phonon number distribution implemented by a laser excitation of nonlinear coupling between the ion's internal—electronic levels and external—motional states. It is demonstrated that the repetitive application of this nonlinear process monotonically accumulates the observable state nonclassicality. The output states converge to a phonon number distribution with high overlap with a particular Fock state and visible quantum non‐Gaussian aspects including corresponding negative Wigner function. The resulting oscillator states prove deterministic transition in the hierarchy of quantum non‐Gaussianity up to four phonons. This transition is very robust against experimental imperfections and produces increasing entanglement potential.